<?php

if (! defined ( 'BASEPATH' ))
	exit ( 'No direct script access allowed' );
/**
 * CodeIgniter
 *
 * An open source application development framework for PHP 5.1.6 or newer
 *
 * @package		CodeIgniter
 * @author		ExpressionEngine Dev Team
 * @copyright	Copyright (c) 2008 - 2011, EllisLab, Inc.
 * @license		http://codeigniter.com/user_guide/license.html
 * @link		http://codeigniter.com
 * @since		Version 1.0
 * @filesource
 */

// ------------------------------------------------------------------------


/**
 * CodeIgniter Security Helpers
 *
 * @package		CodeIgniter
 * @subpackage	Helpers
 * @category	Helpers
 * @author		ExpressionEngine Dev Team
 * @link		http://codeigniter.com/user_guide/helpers/security_helper.html
 */

// ------------------------------------------------------------------------


/**
 * XSS Filtering
 *
 * @access	public
 * @param	string
 * @param	bool	whether or not the content is an image file
 * @return	string
 */
if (! function_exists ( 'xss_clean' )) {
	function xss_clean($str, $is_image = FALSE) {
		$CI = & get_instance ();
		return $CI->security->xss_clean ( $str, $is_image );
	}
}

// ------------------------------------------------------------------------


/**
 * Sanitize Filename
 *
 * @access	public
 * @param	string
 * @return	string
 */
if (! function_exists ( 'sanitize_filename' )) {
	function sanitize_filename($filename) {
		$CI = & get_instance ();
		return $CI->security->sanitize_filename ( $filename );
	}
}

// --------------------------------------------------------------------


/**
 * Hash encode a string
 *
 * @access	public
 * @param	string
 * @return	string
 */
if (! function_exists ( 'do_hash' )) {
	function do_hash($str, $type = 'sha1') {
		if ($type == 'sha1') {
			return sha1 ( $str );
		} else {
			return md5 ( $str );
		}
	}
}

// ------------------------------------------------------------------------


/**
 * Strip Image Tags
 *
 * @access	public
 * @param	string
 * @return	string
 */
if (! function_exists ( 'strip_image_tags' )) {
	function strip_image_tags($str) {
		$str = preg_replace ( "#<img\s+.*?src\s*=\s*[\"'](.+?)[\"'].*?\>#", "\\1", $str );
		$str = preg_replace ( "#<img\s+.*?src\s*=\s*(.+?).*?\>#", "\\1", $str );
		
		return $str;
	}
}

// ------------------------------------------------------------------------


/**
 * Convert PHP tags to entities
 *
 * @access	public
 * @param	string
 * @return	string
 */
if (! function_exists ( 'encode_php_tags' )) {
	function encode_php_tags($str) {
		return str_replace ( array ('<?php', '<?PHP', '<?', '?>' ), array ('&lt;?php', '&lt;?PHP', '&lt;?', '?&gt;' ), $str );
	}
}


/* End of file security_helper.php */
/* Location: ./system/helpers/security_helper.php */